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  • 1
    Electronic Resource
    Electronic Resource
    Availability of nitrogen and phosphorus in forest soils in northeastern Tasmania (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 212-218 
    Details
    ISSN: 1432-0789
    Keywords: Nitrogen mineralization ; Labile organic phosphorus ; Immobilization ; Microbial P ; Eucalypt forest soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rates of N mineralization and of N uptake were measured in situ in three eucalypt forests and a cool-temperate rainforest, and were correlated with productivity. All of the soils had a high capacity for immobilization, and nitrification was insignificant. Changes in both organic and inorganic P fractions during in situ containment of soils were small. While the concentration of inorganic available P was not related to forest productivity, a measure of labile organic P was closely related both to productivity and to P in the microbial biomass. Estimates of inorganic- and organic-N availability were highly correlated with independent estimates of organic-P availability, and the results are discussed in relation to biological control of nutrient availability in the surface horizons of forest soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266481
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  • 2
    Electronic Resource
    Electronic Resource
    Nutrient cycling and nitrogen mineralization in eucalypt forests of south-eastern Australia (1986)
    Springer
    Plant and soil 92 (1986), S. 341-362 
    Details
    ISSN: 1573-5036
    Keywords: Eucalypt forests ; Fire Immobilizxtion ; Nitrogen mineralization ; Nitrogen turnover ; Nitrification ; Nitrogen conservation ; Resilience
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen mineralization was measured in the laboratory andin situ in eight eucalypt forests covering a wide range of climates and soil types. Aerobic and anaerobic incubations as well as chemical indices showed consistently higher rates of mineralization and nitrification and higher mineralization potentials in the wetter, high productivity forests. Nitrification was not confined to these forests and appears best related to soil C/N ratios and the rate of N turnover. Immobilization is recognized as a major process in eucalypt forest soils; in two forests which were burnt by bushfire during this study immobilization prevented over-accumulation of inorganic-N and possible leaching of NO 3 − −N. Calculated fromin situ incubations, annual uptake of inorganic-N ranged from 27 to 160 kg N ha−1; in two of four forests nitrate uptake was not apparent, in a third forest nitrate accounted for 10% of total uptake and in the remaining forest nitrate comprised about one-third of inorganic-N taken up. Ammonium is thus the dominant inorganic form taken up in eucalypt forests of this region. There was general agreement between laboratory andin situ incubations as to the occurrence of nitrification and the difference in mineralization rates between forests. In conjunction with previous studies, the turnover and maintenance of N-pools in eucalypt forests is discussed; forests with low N-capital appear to be resistant to possible N-loss after perturbation, forests with higher N-capital are more susceptible to loss but recover quickly. Immobilization of inorganic-N is central to the recovery process. These results agree with recent hypotheses proposed by Vitousek and Boerner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372483
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    Paper (German National Licenses)
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